At Christmas, I was given The Orb Project book by Miceal Ledwith, DD LLD & Klause Heinemann, PhD. This book is the first scientific study of orbs that I have seen. It is an excellent work.
I encourage anyone interested in orbs to read and decide for yourself what they are and where they come from.
There is also a website of interest about the book . They also have a fascinating video trailer of their new DVD Orbs: The Veil is Lifting - DVD View it by clicking Quicktime or Windows Media